Rotary drill.



T. P. LITAKER. ROTARY DRILL. APPLIGA'ION FILED JAN.24, 1914.

, Patented Oct. 20, 19M

Inventor,

Witnesses Attorneys.

patent No. 1,046,615,

'enormes realta` uragano.,

l orrion.

OF FELLOWS, CALIFORNIA.

mia-aaa.

Specification o! Lettera Patent Patented oet. 2o, 1914.

Application tiled January 24,1914 Serial No. 814,179.

To all whom tmag/ concern Be it known that I, THOMAS F. Lrranan, a citizen of the United States, residing at Fellows, in the county of Kern and State of California, have invented a new and useful Rotary Drill, of which the following is a specification.

This invention relates to rotary drills for use in working stoneand the like, the same being more particularly designed as an 1mprovement upon the structure disclosed in issued to me on December 10, 1912.

Une of the objects of the invention is to provide a stronger and more elicient structure. than has heretofore been devised and to employ improved means for engaging and cutting into the work, said vrneans being attached to the head of the tool in a new and novel manner whereby accidental separation of the parts while in,l use is prevented. With the foregoing and other objects in view which will appear as the description proceeds, the invention resides in the` combination and arrangement of'parts and in the details of construction Vhereinafter described and claimed, vit Abeing understood that changes in th'e'precise embodiment of the invention herein disclosed, can be made within the scope of what is claimed, without departing from thespirit of the invention;

ln the accompanying drawings the pre' ferrcd form of the invention has been shown; 'ln said drawings -Figure 1 is a sideelevation 'of the drill. Fig. 2 is a view partly in front elevation and partly in section. Fig. 3 is an end elevation..

Referring to the figures by characters of reference 1 designates the head of the drill and .formed at one end of this head is a threaded stem 2 adapted to engage a tubular drill rod, not shown. The head1 is provided with spaced legs 3 oppositelyrdisposed and forming an arch, and extending longitudinally through the stem 2 and the head 1 and opening into the arch is abore 4 adapted to receive a tubular lining 5. This lining has an annular flange 6 at its upper end for limiting its downward movement in the bore and the interior of the lining can be of'any desired diameter. The legs 3 are oppositely disposed and have their outer faces rounded as shown in Fig. B whilethe--ilower portions of their inner faces are parallel and directly opposed. Secured to these parallel faces 7 are wear plates 8 and an opening 9 extends 'through each wear plate and the leg to which it is attached, this opening being adapted to receive the threaded portion 10 of a bearing pin 11. Said bearing pin is provided, at its innenend, with a head 12 and between the head and the threaded portion is a cylindrical portion 13 on which a cutting disk 14 is adaptedto rotate.v The threaded portion 10 of the pin is screwed into the leg 3 and unscrewing of the pin is prevented by means of a cotter pin 14 or the like extended through the pin 11 outside of the leg 3.. l The disk 14 is concave-convex, the convex face thereof being'. stepped annularly as shown at 15 so as thus to be reinforced. The

two disks are directly opposed to eachother I and are of like proportions.

Itis thought that the operation of the drill will be readily understood by those v,

skilled in the art.

lated, the disks 14 will also be rotated upon their alining bearing pins 11 and will cut into the surface thereunder, thus forming an opening suliciently large to receive the head 1 and the parts connected thereto. A stream of water is directedinto the lining tube; from the tubular rod,not shown, so that the dust and small particles produced When the drill is ro- 'l by the cutting disks will be washed out of the bore. The wear plates 7 can be renewed whenever desired and the disk 14 can be readily detached simply by removing the ootter pin 14 and unscrewing the pin 11. By providing the peculiar connections described betwccn the disks 14 and legs 3, dangerof the parts becoming accidentally detached, while in use, is reduced to the mini! legs, a bearing pin detachably mounted within each leg. the two bearing pins alining and extending inwardly from the legs, .and a concave-convex cutting disk mounted for rotation on the inwardly extending por- 5 tion of each pin, said disks bein moed for rotation in parallel planes an each disk having a stepped convex faule7 In testimony that I claim the foregoing as my own, I have hereto. aixed my signature 1n the resence of two witnesses.

TH MAS FRANK LITAKER. lVitnesses:

J .'THoMAs JOHNSON, SAM LE BARON. 

